Shinryaku! Ika Musume, Namiuchigiwa no Muromi-san Recommendations
Both series consists of silly dialogue, scenes, and interactions involving sea creatures. In essence, they are supernatural comedies that deals with characters who are not so normal.
Both series follows more of a slice of life style with no different story.
The main female protagonist also seems to have an outgoing personalities from both series that occasionally drives some of the other characters nuts.
Both are based off manga series about sea creatures and their random adventures.
Both of the series are related to sea, full of randomness but funny, many cute girls, stupid & "stalker" characters, and no serious stories
Both of the main characters are so clumsy in some or other ways and flat-chested xD
Also Takeru and Takkun are so similiar
It's perfect for you that don't really like serious story and related episodes